Case Converter
Convert letter case and programming names instantly, preserve selected words, and return to your last chosen format.
đź“ť Basic Cases
đź’» Programming Cases
✨ Special Cases
Convert text to uppercase, lowercase, title case, camelCase and snake_case with a live preview. Choose from 15 modes, preserve ignored words, copy the result and remember your last selected format.
How to convert text case
- Paste or type your text. The first visit defaults to uppercase, and the result updates as you type.
- Choose another letter case or programming naming format. Your next visit restores the last mode selected in this browser.
- Open “Ignored words” to keep names or abbreviations unchanged. Separate entries with commas, for example
iPhone,iOS,USB. - Select “Copy Result” to paste the converted text into a document or editor.
Case conversion examples
Each example starts with hello world.
| Format | Result |
|---|---|
| UPPERCASE | HELLO WORLD |
| lowercase | hello world |
| Title Case | Hello World |
| Sentence case | Hello world |
| camelCase | helloWorld |
| PascalCase | HelloWorld |
| snake_case | hello_world |
| kebab-case | hello-world |
| CONSTANT_CASE | HELLO_WORLD |
| dot.case | hello.world |
| path/case | hello/world |
Letter case modes help standardize English text. Programming formats are useful for variable names, field names and filenames. The remaining modes provide alternating case, Chinese financial numerals, Japanese financial numerals and English amount wording. Enter a numeric amount for amount modes rather than a paragraph.
Preserve words such as iPhone and USB
The dictionary matches English word boundaries without case sensitivity and preserves each match exactly as it appeared in the input. With iPhone,USB in the dictionary, uppercasing iPhone and USB produces iPhone AND USB. An input of iphone stays iphone; the dictionary does not correct brand spelling. Changes update the result immediately and are saved when you leave the dictionary field.
Frequently asked questions
Is title case a complete APA style implementation?
No. It uses a simplified rule: capitalize the first and last words of each line, and keep listed minor words such as a, the, and and of lowercase in between. It does not recognize every proper noun or cover the full APA title rules.
Can it split an existing camelCase or snake_case identifier?
Programming modes mainly join words separated by spaces and preserve line breaks. Start with text such as user name; existing identifiers such as userName or user_name are not automatically split into words. You can paste multiple lines at once. Title case also collapses extra whitespace within each line.
Is my text uploaded or remembered?
Conversion runs in your browser. This page saves only the selected mode and ignored words locally, not the input or output text. Clearing this site's browser data resets those preferences.
For further editing, use the character and word counter, text line processor or bulk text replacement tool.